lib/CodeGen/MachineDominators.cpp

   1 //===- MachineDominators.cpp - Machine Dominator Calculation --------------===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is distributed under the University of Illinois Open Source
   6 // License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9 //
  10 // This file implements simple dominator construction algorithms for finding
  11 // forward dominators on machine functions.
  12 //
  13 //===----------------------------------------------------------------------===//
  14
  15 #include "llvm/CodeGen/MachineDominators.h"
  16 #include "llvm/CodeGen/Passes.h"
  17
  18 using namespace llvm;
  19
  20 namespace llvm {
  21 TEMPLATE_INSTANTIATION(class DomTreeNodeBase<MachineBasicBlock>);
  22 TEMPLATE_INSTANTIATION(class DominatorTreeBase<MachineBasicBlock>);
  23 }
  24
  25 char MachineDominatorTree::ID = 0;
  26
  27 INITIALIZE_PASS(MachineDominatorTree, "machinedomtree",
  28                 "MachineDominator Tree Construction", true, true)
  29
  30 char &llvm::MachineDominatorsID = MachineDominatorTree::ID;
  31
  32 void MachineDominatorTree::getAnalysisUsage(AnalysisUsage &AU) const {
  33   AU.setPreservesAll();
  34   MachineFunctionPass::getAnalysisUsage(AU);
  35 }
  36
  37 bool MachineDominatorTree::runOnMachineFunction(MachineFunction &F) {
  38   CriticalEdgesToSplit.clear();
  39   NewBBs.clear();
  40   DT->recalculate(F);
  41
  42   return false;
  43 }
  44
  45 MachineDominatorTree::MachineDominatorTree()
  46     : MachineFunctionPass(ID) {
  47   initializeMachineDominatorTreePass(*PassRegistry::getPassRegistry());
  48   DT = new DominatorTreeBase<MachineBasicBlock>(false);
  49 }
  50
  51 MachineDominatorTree::~MachineDominatorTree() {
  52   delete DT;
  53 }
  54
  55 void MachineDominatorTree::releaseMemory() {
  56   DT->releaseMemory();
  57 }
  58
  59 void MachineDominatorTree::print(raw_ostream &OS, const Module*) const {
  60   DT->print(OS);
  61 }